• Superb light transmission of 96% at the H-Alpha 656nm spectral line, ensuring adequate capture of details.
• Half Width Half Maximum bandpass of 6nm to filter out wavelengths outside of the H-Alpha spectral range, making details even in light polluted locations more apparent.
• Blocks unwanted light from UV up to IR, thus removing excess stray light and scatter.
• Parfocal with other Astronomik filters making refocusing unnecessary when switching between different filters using the same imaging and optics configuration.
• Designed to work with optics up to f/4 focal ratio. Anything faster, the MaxFR version are recommended instead to account for band shifting.
• 1mm thickness.
• Moisture and scratch resistant.
• Includes small storage box to be protected from external damage when not in use.
• This configuration of the H-Alpha 6nm filter is Nikon XL Full Frame Clip .

The Astronomik 6nm H-alpha Filter is geared for capturing images of nebulae that are hydrogen abundant. Since it filters out wavelengths beyond the 656nm spectral line with a full width half maximum bandpass of 6nm,  it emphasizes the Hydrogen alpha spectral line away from the rest of the spectral range so details become more apparent. Due to its extreme narrowband features, it is helpful for astrophotography even in light polluted areas since light pollution wavelengths are generally outside of this range. With a rocksolid 96% light transmission rate, imagers can be rest assured that no significant loss of light will miss hitting the camera sensor, thus ensuring exposures are crisp with maximum illumination consistent with the sensor quantum efficiency and full well capacity.